What was found
ON APPROACH, STAB-TRIM WENT NOSE-UP. CREW SUCCESSFUL IN RESETTING CIRCUIT-BREAKER. EMERGENCY DECLARED. FLIGHT LANDED WITH NO FURTHER INCIDENT. *S/D* AN INTERNAL FAILURE IN THE LEFT STABILIZER TRIM CONTROL MODULE (STCM) INHIBITED MOVEMENT OF THE HORZ STABILIZER. THE LEFT STCM WAS REPLACED PER 767-222 MM. ALL FINAL OPS CHECKS WERE GOOD. DUE TO THE POSSIBILITY OF A DUAL FAILURE, THE RIGHT STCM WAS REPLACED AND OPS CHECKED PER 767-222 MM AND ALL CHECKED GOOD. ALSO THE STABILIZER TRIM HYDRAULIC SHUTOFF SWITCHES WERE OPERATIONALLY CHECKED AND TESTED PER 767-222 MM AND SWITCHES OPS CHECKED GOOD.